Influence of anisotropic permeability on convection in porous media: Implications for geological CO2 sequestration
Influence of anisotropic permeability on convection in porous media: Implications for geological CO2 sequestration
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DOI：
10.1063/1.4947425
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发表时间：
2016-05
影响因子：
4.6
通讯作者：
M. Paoli;F. Zonta;A. Soldati
中科院分区：
文献类型：
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作者：
M. Paoli;F. Zonta;A. Soldati
高Rayleigh-Darcy数下多孔介质中的溶质对流具有重要的基本特征，也可能对地质CO2封存过程产生影响。借助于直接数值模拟，我们研究了各向异性渗透率对流体饱和多孔介质中溶质浓度分布的作用。我们的计算分析跨越了几十年的瑞利-达西数，并证实了以前在文献中发现的努塞尔数的线性标度。此外，我们发现各向异性渗透率γ < 1，即，垂直渗透率小于水平渗透率，与各向同性条件相比，有效地增加了努塞尔数。我们将这种看似违反直觉的效果与各向异性条件下对流动拓扑结构的修改联系起来。最后，我们使用我们为双侧配置计算的数据（即，狄利克雷条件的上，下边界），以检查时间演变的溶质…
Solute convection in porous media at high Rayleigh-Darcy numbers has important fundamental features and may also bear implications for geological CO2 sequestration processes. With the aid of direct numerical simulations, we examine the role of anisotropic permeability on the distribution of solutal concentration in fluid saturated porous medium. Our computational analyses span over few decades of Rayleigh-Darcy number and confirm the linear scaling of Nusselt number that was previously found in the literature. In addition, we find that anisotropic permeability γ < 1, i.e., with vertical permeability smaller than horizontal permeability, effectively increases the Nusselt number compared with isotropic conditions. We link this seemingly counterintuitive effect with the occurring modifications to the flow topology in the anisotropic conditions. Finally, we use our data computed for the two-sided configuration (i.e., Dirichlet conditions on upper and lower boundaries) to examine the time evolution of solutal ...